well... that was a bit of a cop out of an ending.
For all that we are told the wars were won by GDI, in the end it was NOD who won.
That's because you've defined "GDI winning" as "Nod being entirely conquered and subsumed by GDI," and "anything other than Nod being entirely conquered and subsumed by GDI" as "Nod winning."
By that standard, Nod 'won,' but by that very lopsided standard, GDI never had the realistic capacity to 'win' in the first place. At any point during the quest timeline, a total war in which GDI attempted to fully conquer Nod would predictably result in GDI taking so much damage that the 'victorious' GDI would have been unable to save the Earth from tiberium.
So by putting together such a definition of victory, you've set your expectations in such a way as to ensure that no outcome could plausibly be satisfactory by the standards you're applying.
No conflict can truly be won in the eyes of a person whose theory of victory is itself self-defeating.
Kane got what he wanted, GDI did Kane´s work, NOD continues to exist and will spread beyond Earth, GDI leadership decided to support Kane lies and i think there were supposed to be some Scryn left in Jupiter?
I mean, just allowing NOD to leave earth ensures hostile first contact and, later, relations when they inevitably smuggle Tiberium around
Much of what you say here is either flatly untrue or requires very strange and dare I say unreasonable interpretatins of the meanings of words.
Did "Kane get what he wanted?" Well, Kane wanted a lot of things. For a long time, roughly an entire human lifetime, Kane seems to have wanted to rule the Earth. He didn't get that. It seems clear that Kane wanted to prove that Nod's way of doing things,
his way, is superior. He failed utterly. Kane got to leave Earth, granted. If your idea of "victory" cannot exist without Kane being imprisoned and/or executed, then yeah, that didn't happen... but then, we didn't really have the means to
make that happen, I would say, without sacrificing the survival of the Earth.
Did GDI "do Kane's work?" I don't even know what you mean by that. GDI built a system of machines to Kane's specifications, but GDI built the machines because of a goal that GDI and Kane agreed upon in advance. I don't see how that counts as "doing Kane's work."
Nod continues to exist and will spread beyond Earth, yes, but as mentioned above, if your theory of victory means that there can be no victory without that, then your theory of victory was always, by nature, self-defeating, in the literal sense of "trying to win would result in GDI defeating itself."
GDI leadership "decided to support Kane lies?" What do you mean, except perhaps for Seo deciding not to try to stop Kane from leaving the planet? I'm not seeing how that counts as 'supporting Kane lies.' GDI frankly wanted Kane gone too, because it is not to GDI's advantage if Kane stays around. He's untrustworthy and wildly hated by so many GDI citizens, and at the same time any attempt to take him into custody on GDI's part would predictably have kicked off a war with Nod and ruined everything. Kane deciding to fuck off into the cosmos and leave Earth behind was frankly probably best for GDI. And as far as I know, Kane made the modifications that would allow him to leave using Nod's own resources, and Nod didn't fall behind on its TCN targets according to Seo, so what's what's the harm?
And "were there Scrin left arund Jupiter?" Well, yes. GDI went out and killed them all during the timeskip. Bloody operation, didn't go as well as we might have liked, but the job got done. What's the problem?